The Steiner Optics's 7x30 Navigator Open-Hinge Marine Binoculars are the natural evolution of their iconic Marine series that sees the combination of a traditional Porro prism light path integrated into an ergonomic open-bridge design. The prism system is naturally balanced and comfortable to hold and the open design provides more surface area to ensure a secure grip—reducing fatigue when you spend long periods of time behind the eyepieces. Complementing these ergonomic features are high-contrast multicoatings that enhance the view and Steiner's Sports Auto Focus system which allows you to focus each eyepiece just one time, eliminating the need to refocus again, regardless of how near or far the subject is—or if it is moving.